Checking transistorized control ignition module (T.C.I Unit) — VW
Checking transistorized control ignition module (T.C.I Unit) on VW: 12 steps. What to remove, in what order, and what to check after.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
📋 Procedure
- ⚠ The respective measuring range is to be selected before connecting up the test cables to prevent destruction of the electrical components. — Disconnect plug at T.C.I unit.
- Use auxiliary leads from Measuring appliance setV.A.G 1594/C to connect up Portable multimeterV.A.G 1526/A between contacts 4 and 6 on plug.
- Switch on ignition.
- Switch off the ignition
- Reconnect plug at T.C.I unit.
- Disconnect plug at Hall sender.
- Use auxiliary leads from measuring appliance setV.A.G 1594/C to connect up portable multimeterV.A.G 1526/A between terminal 1 (-) and terminal 15 (+) of ignition transformer.
- Switch on ignition.
- Briefly connect centre wire of connector at distributor to earth.
- Switch off ignition.
- Use auxiliary leads from measuring appliance setV.A.G 1594/C to connect up portable multimeterV.A.G 1526/A to outer contacts of plug of Hall sender at distributor.
- Switch on ignition
Other VW procedures
- Removing engine · 41 torque figures
- Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
- Adjusting valve timing – VW Passat B5 · 83 torque figures
- Removing and installing camshafts – VW Passat B6 · 39 torque figures
- Removing and installing coolant pump · 53 torque figures
- Vehicles with 6-cyl. TDI engine, coolant-cooled alternator · 1 torque figures
- Calibrating reversing camera
- Removing and installing left catalytic converter, bank 2
- Removing and installing vacuum line with vacuum sender G608, right-hand drive model
- Removing and installing turbocharger on left – VW Touareg II
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.